Custom Wishbones for Sierra rear sub-assembly

[rat7]

hey guys.

has anyone out there created soe custom wishbones for a sierra rear sub-assembly.

I've got a robin hood and find to sit right it has the semi trailing arms declined towards the pivot which gives loads of negative camber.

looking into modding these or creating new wishbones to adjust the angle of the hub to create less camber.

If anyone has done this please let me know.

[Jon Ison]

For a winter project you could get some MK rear uprights and double wishbone set up, you'd have to fabricate mounting brackets for the wishbones though.

The MK rear uprights are designed for seirra hubs.

[teecee]

Go to www.locostbuilders.co.uk/ and do a search.

[Jon Ison]

bit missleading, MK would/could supply the mounting brakets it would be mounting them to the chassis that would need fabrication.

www.mk-sportscars.fsnet.co.uk/

[rat7]

Thanks guys but I would like to keep the original sierra sub frame and mod the trailing arms or fabricate new ones to new spec.

Still wondering if anyone else has done this yet?

[shawspeed]

This was done years ago on the sierra rally cars- circa 1987. The rubber bushes were substituted for rose joint which allowed both the toe-in and camber to be adjusted. Steel rose jointed arms are now like hen's teeth to find as they were quickly superseded by magnesium items

[accident]

why would you want to keep the big heavy standard beam?

[rat7]

shawspeed said:

This was done years ago on the sierra rally cars- circa 1987. The rubber bushes were substituted for rose joint which allowed both the toe-in and camber to be adjusted. Steel rose jointed arms are now like hen's teeth to find as they were quickly superseded by magnesium items

So are these about or just specialist items?

[rat7]

accident said:

why would you want to keep the big heavy standard beam?

purely because the chassis is designed around it and don't want a huge job of a complete rear end redesign.

The next build will be performance oriented

[shawspeed]

Yes they are around steel arms are hard to find magnesium ones are easier but will cost between £500-£1000 pair

[KITT]

If you're looking to remove the huge amounts of negative camber from the Sierra rear axle, then I believe a number of Robin Hood owners use some kind of wedge shaped adapters between the hubs and the wishbones. Not sure of the details but it has been done before, so perhaps worth asking some RH owners.

[rat7]

KITT said:

If you're looking to remove the huge amounts of negative camber from the Sierra rear axle, then I believe a number of Robin Hood owners use some kind of wedge shaped adapters between the hubs and the wishbones. Not sure of the details but it has been done before, so perhaps worth asking some RH owners.

Thanks for that kitt. Will look into that. was wondering on something similar.

[GreenV8S]

I assume you are getting the camber (and toe?) changes because you're running the trailing arms a long way from their designed ride height. You can correct the static geometry easily enough, but I'm curious to know whether you need to do anything about the roll center, dynamic camber, roll steer and so on?

[rat7]

GreenV8S said:

I assume you are getting the camber (and toe?) changes because you're running the trailing arms a long way from their designed ride height. You can correct the static geometry easily enough, but I'm curious to know whether you need to do anything about the roll center, dynamic camber, roll steer and so on?

me too. Am planning on looking into it this xmas when i go home from uni for hols. Then perhaps create new wishbones altogether.

[GreenV8S]

rat7 said:

Then perhaps create new wishbones altogether.

That seems like the smarter approach, to me. The V8S has semi-trailing geometry too, and it has its advantages, but there's a good reason why just about every serious performance car uses twin wishbones these days.

[Y2K RS]

if you go onto passionford.com and give Brom at Zoo motorsport or Mike Rainbird at R&B Motorsport a shout on the main message board they can provide both adjustable arms or shims to suit your needs